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Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

CVE-2026-48717OpenAM OAuth Authorization Bypass via PKCE Challenge

Critical 9.1

In plain English

A critical-severity security flaw in OpenAM from OpenIdentityPlatform. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.1Critical
Exploit odds (30 days)0.5%top 55.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, AuthorizationCodeGrantTypeHandler requires a code_verifier only when the realm-wide codeVerifierEnforced setting is enabled, even when an authorization code stores a code_challenge. Because that setting is disabled by default, an attacker who intercepts a PKCE-protected authorization code can omit code_verifier and redeem the code, while an explicitly incorrect verifier is rejected. Public clients are directly affected, and confidential-client exploitation additionally requires client authentication material or another redemption context. This issue is fixed in version 16.1.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.openidentityplatform.openam:openam-oauth216.1.1GHSA-4v2w-2wqp-mc85

Affected products (as reported)

VendorProductVersions
OpenIdentityPlatform OpenAM < 16.1.1

Weakness: CWE-285 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References